A loop of wire with a radius of 2.0cm lies in the xy -plane and is centered on the origin. It carries a counterclockwise current of 1.0 A when viewed from above the xy -plane. A long, straight wire lies along the line y=2.0cm. so that it is tangent to the lowest point on the loop. This straight wire carries a current of 1.0 A in the negative x-direction. What is the strength of the magnetic field at the center of the loop?